Compilers Good First Issues

compilers

Open

JSDoc present in mapped types is not output in generated type literals in declaration files

Domain: Declaration EmitHelp WantedPossible Improvement

Microsoft/TypeScript #62,309 opened Aug 20, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments5 reactions0 assignees

Open

Contextual typing doesn't work when mixing up discriminated unions with function variant

Domain: check: Contextual TypesHelp WantedPossible Improvement

Microsoft/TypeScript #62,306 opened Aug 20, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

6 comments0 reactions0 assignees

Open

Incorrect emitted declaration for unique symbol re-assignment

BugDomain: Declaration EmitHelp Wanted

Microsoft/TypeScript #62,305 opened Aug 19, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

1 comment0 reactions0 assignees

Open

abstract type guard does not narrow when keyed with a unique symbol

BugDomain: check: Control FlowHelp Wanted

Microsoft/TypeScript #62,247 opened Aug 10, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · No comments yet

No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available

0 comments0 reactions0 assignees

Open

JSDoc tags not parsed when a type may be present

BugDomain: JSDocHelp Wanted

Microsoft/TypeScript #62,244 opened Aug 9, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments1 reaction0 assignees

Open

`verbatimModuleSyntax` leaves empty curly brackets in the JS output

Domain: ES ModulesHelp WantedPossible Improvement

Microsoft/TypeScript #62,239 opened Aug 8, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

1 comment0 reactions0 assignees

Open

`as const` breaks intra expression inference

Domain: check: Type InferenceHelp WantedPossible Improvement

Microsoft/TypeScript #62,220 opened Aug 6, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · No comments yet

No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available

0 comments1 reaction0 assignees

Open

Confusing missing property error in a circular situation

Domain: Mapped TypesHelp WantedPossible Improvement

Microsoft/TypeScript #62,180 opened Aug 3, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · No comments yet

No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available

0 comments0 reactions0 assignees

Open

No error on self-referencing type parameter of non-generic mapped type

BugDomain: Mapped TypesHelp Wanted

Microsoft/TypeScript #62,176 opened Aug 2, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · No comments yet

No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available

0 comments2 reactions0 assignees

Open

ILGenerator imposes artificial limitations on otherwise valid IL

area-System.Reflection.Emithelp wanted

dotnet/runtime #118,238 opened Jul 31, 2025 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

6 comments0 reactions0 assignees

Open

Allow PublicApiAnalyzers to track internal APIs with `[Internal]` prefix

Area-AnalyzersArea-IDEhelp wanted

dotnet/roslyn #79,658 opened Jul 29, 2025 · C# · 20,414 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

1 comment1 reaction0 assignees

Open

crypto/internal/fips140,cmd/link: fips140 broken on RISC-V with `-buildmode=pie`

BugReportNeedsInvestigationarch-riscvcompiler/runtimehelp wanted

golang/go #74,683 opened Jul 21, 2025 · Go · 133,883 stars

Why recommendedHas a beginner-friendly label · Contributing guide available

Has a beginner-friendly labelContributing guide available

20 comments0 reactions1 assignee

Open

Spread operator allows invalid return type in record data types

BugDomain: check: Type InferenceHelp Wanted

Microsoft/TypeScript #62,095 opened Jul 20, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

1 comment0 reactions0 assignees

Open

Unable to infer parameters for generic constructor/functions with a distributive conditional type

BugDomain: Conditional TypesHelp Wanted

Microsoft/TypeScript #62,079 opened Jul 16, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

1 comment0 reactions0 assignees

Open

"await x as any" - Node PartiallyEmittedExpression did not pass test 'isLeftHandSideExpression' assert triggered

BugDomain: API: TransformsFix AvailableHelp Wanted

Microsoft/TypeScript #62,072 opened Jul 15, 2025 · TypeScript · 48,455 stars

Why recommendedHas a beginner-friendly label · Contributing guide available

Has a beginner-friendly labelContributing guide available

1 comment1 reaction1 assignee

Open

Type inference regression on function calls not saved to variables, due to #61668

Domain: check: Type InferenceHelp WantedPossible Improvement

Microsoft/TypeScript #62,071 opened Jul 15, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

1 comment5 reactions0 assignees

Open

Derived class constructor parameter incorrectly inherits JSDoc from parent class's field of the same name

BugDomain: JSDocHelp Wanted

Microsoft/TypeScript #62,069 opened Jul 15, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · No comments yet

No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available

0 comments1 reaction0 assignees

Open

Control Flow Analysis Performance Regression

Domain: PerformanceHelp WantedPossible Improvement

Microsoft/TypeScript #62,050 opened Jul 12, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · No comments yet

No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available

0 comments0 reactions0 assignees

Open

cmd/compile: significant performance difference between 'strs[i] == str' and 'str == strs[i]'"

BugReportNeedsFixPerformancecompiler/runtimehelp wanted

golang/go #74,471 opened Jul 4, 2025 · Go · 133,883 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

14 comments1 reaction0 assignees

Open

Inconsistent behavior with Generic ElementType

Domain: JSX/TSXHelp WantedPossible Improvement

Microsoft/TypeScript #61,995 opened Jul 3, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments0 reactions0 assignees

compilers

Open

JSDoc present in mapped types is not output in generated type literals in declaration files

Domain: Declaration EmitHelp WantedPossible Improvement

Microsoft/TypeScript #62,309 opened Aug 20, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments5 reactions0 assignees

Open

Contextual typing doesn't work when mixing up discriminated unions with function variant

Domain: check: Contextual TypesHelp WantedPossible Improvement

Microsoft/TypeScript #62,306 opened Aug 20, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

6 comments0 reactions0 assignees

Open

Incorrect emitted declaration for unique symbol re-assignment

BugDomain: Declaration EmitHelp Wanted

Microsoft/TypeScript #62,305 opened Aug 19, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

1 comment0 reactions0 assignees

Open

abstract type guard does not narrow when keyed with a unique symbol

BugDomain: check: Control FlowHelp Wanted

Microsoft/TypeScript #62,247 opened Aug 10, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · No comments yet

No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available

0 comments0 reactions0 assignees

Open

JSDoc tags not parsed when a type may be present

BugDomain: JSDocHelp Wanted

Microsoft/TypeScript #62,244 opened Aug 9, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments1 reaction0 assignees

Open

`verbatimModuleSyntax` leaves empty curly brackets in the JS output

Domain: ES ModulesHelp WantedPossible Improvement

Microsoft/TypeScript #62,239 opened Aug 8, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

1 comment0 reactions0 assignees

Open

`as const` breaks intra expression inference

Domain: check: Type InferenceHelp WantedPossible Improvement

Microsoft/TypeScript #62,220 opened Aug 6, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · No comments yet

No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available

0 comments1 reaction0 assignees

Open

Confusing missing property error in a circular situation

Domain: Mapped TypesHelp WantedPossible Improvement

Microsoft/TypeScript #62,180 opened Aug 3, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · No comments yet

No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available

0 comments0 reactions0 assignees

Open

No error on self-referencing type parameter of non-generic mapped type

BugDomain: Mapped TypesHelp Wanted

Microsoft/TypeScript #62,176 opened Aug 2, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · No comments yet

No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available

0 comments2 reactions0 assignees

Open

ILGenerator imposes artificial limitations on otherwise valid IL

area-System.Reflection.Emithelp wanted

dotnet/runtime #118,238 opened Jul 31, 2025 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

6 comments0 reactions0 assignees

Open

Allow PublicApiAnalyzers to track internal APIs with `[Internal]` prefix

Area-AnalyzersArea-IDEhelp wanted

dotnet/roslyn #79,658 opened Jul 29, 2025 · C# · 20,414 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

1 comment1 reaction0 assignees

Open

crypto/internal/fips140,cmd/link: fips140 broken on RISC-V with `-buildmode=pie`

BugReportNeedsInvestigationarch-riscvcompiler/runtimehelp wanted

golang/go #74,683 opened Jul 21, 2025 · Go · 133,883 stars

Why recommendedHas a beginner-friendly label · Contributing guide available

Has a beginner-friendly labelContributing guide available

20 comments0 reactions1 assignee

Open

Spread operator allows invalid return type in record data types

BugDomain: check: Type InferenceHelp Wanted

Microsoft/TypeScript #62,095 opened Jul 20, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

1 comment0 reactions0 assignees

Open

Unable to infer parameters for generic constructor/functions with a distributive conditional type

BugDomain: Conditional TypesHelp Wanted

Microsoft/TypeScript #62,079 opened Jul 16, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

1 comment0 reactions0 assignees

Open

"await x as any" - Node PartiallyEmittedExpression did not pass test 'isLeftHandSideExpression' assert triggered

BugDomain: API: TransformsFix AvailableHelp Wanted

Microsoft/TypeScript #62,072 opened Jul 15, 2025 · TypeScript · 48,455 stars

Why recommendedHas a beginner-friendly label · Contributing guide available

Has a beginner-friendly labelContributing guide available

1 comment1 reaction1 assignee

Open

Type inference regression on function calls not saved to variables, due to #61668

Domain: check: Type InferenceHelp WantedPossible Improvement

Microsoft/TypeScript #62,071 opened Jul 15, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

1 comment5 reactions0 assignees

Open

Derived class constructor parameter incorrectly inherits JSDoc from parent class's field of the same name

BugDomain: JSDocHelp Wanted

Microsoft/TypeScript #62,069 opened Jul 15, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · No comments yet

No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available

0 comments1 reaction0 assignees

Open

Control Flow Analysis Performance Regression

Domain: PerformanceHelp WantedPossible Improvement

Microsoft/TypeScript #62,050 opened Jul 12, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · No comments yet

No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available

0 comments0 reactions0 assignees

Open

cmd/compile: significant performance difference between 'strs[i] == str' and 'str == strs[i]'"

BugReportNeedsFixPerformancecompiler/runtimehelp wanted

golang/go #74,471 opened Jul 4, 2025 · Go · 133,883 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

14 comments1 reaction0 assignees

Open

Inconsistent behavior with Generic ElementType

Domain: JSX/TSXHelp WantedPossible Improvement

Microsoft/TypeScript #61,995 opened Jul 3, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments0 reactions0 assignees

compilers

Open

JSDoc present in mapped types is not output in generated type literals in declaration files

Domain: Declaration EmitHelp WantedPossible Improvement

Microsoft/TypeScript #62,309 opened Aug 20, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments5 reactions0 assignees

Open

Contextual typing doesn't work when mixing up discriminated unions with function variant

Domain: check: Contextual TypesHelp WantedPossible Improvement

Microsoft/TypeScript #62,306 opened Aug 20, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

6 comments0 reactions0 assignees

Open

Incorrect emitted declaration for unique symbol re-assignment

BugDomain: Declaration EmitHelp Wanted

Microsoft/TypeScript #62,305 opened Aug 19, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

1 comment0 reactions0 assignees

Open

abstract type guard does not narrow when keyed with a unique symbol

BugDomain: check: Control FlowHelp Wanted

Microsoft/TypeScript #62,247 opened Aug 10, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · No comments yet

No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available

0 comments0 reactions0 assignees

Open

JSDoc tags not parsed when a type may be present

BugDomain: JSDocHelp Wanted

Microsoft/TypeScript #62,244 opened Aug 9, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments1 reaction0 assignees

Open

`verbatimModuleSyntax` leaves empty curly brackets in the JS output

Domain: ES ModulesHelp WantedPossible Improvement

Microsoft/TypeScript #62,239 opened Aug 8, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

1 comment0 reactions0 assignees

Open

`as const` breaks intra expression inference

Domain: check: Type InferenceHelp WantedPossible Improvement

Microsoft/TypeScript #62,220 opened Aug 6, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · No comments yet

No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available

0 comments1 reaction0 assignees

Open

Confusing missing property error in a circular situation

Domain: Mapped TypesHelp WantedPossible Improvement

Microsoft/TypeScript #62,180 opened Aug 3, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · No comments yet

No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available

0 comments0 reactions0 assignees

Open

No error on self-referencing type parameter of non-generic mapped type

BugDomain: Mapped TypesHelp Wanted

Microsoft/TypeScript #62,176 opened Aug 2, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · No comments yet

No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available

0 comments2 reactions0 assignees

Open

ILGenerator imposes artificial limitations on otherwise valid IL

area-System.Reflection.Emithelp wanted

dotnet/runtime #118,238 opened Jul 31, 2025 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

6 comments0 reactions0 assignees

Open

Allow PublicApiAnalyzers to track internal APIs with `[Internal]` prefix

Area-AnalyzersArea-IDEhelp wanted

dotnet/roslyn #79,658 opened Jul 29, 2025 · C# · 20,414 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

1 comment1 reaction0 assignees

Open

crypto/internal/fips140,cmd/link: fips140 broken on RISC-V with `-buildmode=pie`

BugReportNeedsInvestigationarch-riscvcompiler/runtimehelp wanted

golang/go #74,683 opened Jul 21, 2025 · Go · 133,883 stars

Why recommendedHas a beginner-friendly label · Contributing guide available

Has a beginner-friendly labelContributing guide available

20 comments0 reactions1 assignee

Open

Spread operator allows invalid return type in record data types

BugDomain: check: Type InferenceHelp Wanted

Microsoft/TypeScript #62,095 opened Jul 20, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

1 comment0 reactions0 assignees

Open

Unable to infer parameters for generic constructor/functions with a distributive conditional type

BugDomain: Conditional TypesHelp Wanted

Microsoft/TypeScript #62,079 opened Jul 16, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

1 comment0 reactions0 assignees

Open

"await x as any" - Node PartiallyEmittedExpression did not pass test 'isLeftHandSideExpression' assert triggered

BugDomain: API: TransformsFix AvailableHelp Wanted

Microsoft/TypeScript #62,072 opened Jul 15, 2025 · TypeScript · 48,455 stars

Why recommendedHas a beginner-friendly label · Contributing guide available

Has a beginner-friendly labelContributing guide available

1 comment1 reaction1 assignee

Open

Type inference regression on function calls not saved to variables, due to #61668

Domain: check: Type InferenceHelp WantedPossible Improvement

Microsoft/TypeScript #62,071 opened Jul 15, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

1 comment5 reactions0 assignees

Open

Derived class constructor parameter incorrectly inherits JSDoc from parent class's field of the same name

BugDomain: JSDocHelp Wanted

Microsoft/TypeScript #62,069 opened Jul 15, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · No comments yet

No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available

0 comments1 reaction0 assignees

Open

Control Flow Analysis Performance Regression

Domain: PerformanceHelp WantedPossible Improvement

Microsoft/TypeScript #62,050 opened Jul 12, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · No comments yet

No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available

0 comments0 reactions0 assignees

Open

cmd/compile: significant performance difference between 'strs[i] == str' and 'str == strs[i]'"

BugReportNeedsFixPerformancecompiler/runtimehelp wanted

golang/go #74,471 opened Jul 4, 2025 · Go · 133,883 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

14 comments1 reaction0 assignees

Open

Inconsistent behavior with Generic ElementType

Domain: JSX/TSXHelp WantedPossible Improvement

Microsoft/TypeScript #61,995 opened Jul 3, 2025 · TypeScript · 48,455 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments0 reactions0 assignees

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Compilers Good First Issues